Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9503f737f9da0a1…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 17:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a5d629390e520962ba74b2379ea05ab SHA-1: a80bf3e4e2ed75a9bd6e4b71b4b297eab8f8ea52 SHA-256: b9503f737f9da0a1ea2b83788f1faee80fd21650ec783e4265a900a2f3e7c177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/towezolugapujexo.pdf In PDF document text
    • https://immo-macedo.lu/userfiles/files/wifuxebojesagevidob.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afd357d785f---turatizumalevuka.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d74498c6e75---ketawapowutor.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7d83e1ee---daluribofiwup.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/f7ki601cd639hk1hagnd9u3sc3/rigiketoduxolibefenafoxox.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/91502709815.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/67640910444.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607475d87c12a---85703899791.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/7585e5361982efb7c3c636e80b3cc82a/vadadiponewukufipulitoj.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/38541208211.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/kesavekebomusakarepuro.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b760a3dada4---jofusufuguw.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a3c740f1249ad8da8fe0c791eb5048d8/64661046348.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5aae6a7ff---64063000163.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/mm9kb2ino5aq77lr7nn6jqcofd/zitawewufigutonababetibug.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/85c14ad6486638494f088b59fd9dc77e/nejefubivenaxus.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/zelixamerurugi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fce7bc60af---jegowotorenijurelufap.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3dkbhvcvseacv01hnkfb9l7usc/rufifafewadisubiladevel.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/va2ctkf245tnb8d05b904ckbbb/begunajozizadete.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a8af2eacbd58503cb9a1508a63df7d2f/82493885520.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/zomefaleruribibo.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/6498578009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=risalatul+jamiah+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 10580 bytes
SHA-256: e88d33df51cf029821229a3e7afef84beee0af052ca6d7686a436a079d653159
font_02_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 19420 bytes
SHA-256: 1675702cc1983e1fa3ae11156aa473b421249570101210d9a315a7f8050a1bf8

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